class_docstr: RNG provider that derives new RNGs from the key
code: def __str__(self):
      return "Derive({})".format(self.seed)
  
file_path: lkpy/lenskit/util/random.py
imports: import numpy
  import seedbank
label_desc: Use image node_id 3 for calling the DerivingRNG obj's underlying member method code with example usage: obj.__str__() and returns: str